Description ADULT MALE BREEDING Has streaked black and white back and nape, and blackish wings with pale feather edges and two bold white wing bars. Crown is yellowish and face is white, but with broad, blackish line through eye and blackish "mustache" line. Underparts are mostly white, but has striking chestnut band along flanks. ADULT FEMALE BREEDING Similar, but duller and less colorful overall, with streaked crown and less extensive chestnut on flanks. ADULT NONBREEDING (seen in fall) Retains some chestnut on flanks and striking wing bars, but has yellowish green upperparts and gray face and throat, grading to otherwise whitish underparts. Note the white eyering. IMMATURE Similar to fall adult, but lacks chestnut on flanks.